Related Questions

When the bolts are subjected to reversal of stresses, the most suitable type of bolt is
A Black bolt
B Ordinary unfinished bolt
C Turned and fitted bolt
D High strength bolt
Find out which quotation parts of the following sentences has an error. If one 'wants' to keep up with the rapid advances in the rapid advances in work place 'technology' 'they' must plan 'to take' frequent refresher courses.
A wants
B technology
C they
D to take
Magnetism of a magnet can be destroyed by
A heating
B hammering
C by inductive action of another magnet
D by all above methods
Which one of the following phrases best describes residual magnetism?
A Magnetism that remains in the core of an electromagnet after the current through the coil is turned off
B The force of attraction between the poles of a permanent and temporary magnetic field
C The amount of magnetic flux that is not confined to the core material of an electromagnet
D The circular magnetic field that surrounds a conductor carrying a current
E None of the above
Which of the following D.C. generators will be in a position to build up without any residual magnetism in the poles ?
A Series generator
B Shunt generator
C Compound generator
D None of the above
Following D.C. generator will be in a position to build up without any residual magnetism in the poles
A Series generator
B Shunt generator
C Compound generator
D Self-excited generator
In D.C. machines the residual magnetism is of the order of
A 2 to 3 percent
B 10 to 15 percent
C 20 to 25 percent
D 50 to 75 percent
The magnetism left in the iron after exciting field has been removed is known as
A permeance
B residual magnetism
C susceptance
D reluctance
Indicate which of the following material does not retain magnetism permanently.
A Soft iron
B Stainless steel
C Hardened steel
D None of the above
The commonly used material for shielding or screening magnetism is
A copper
B aluminium
C soft iron
D brass

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